import React, { Component } from 'react';
// 引入store，用于获取store中保存的状态
import store from '../../redux/store'
// 引入action creator专门用于创建action对象
import { createIncrementAction, createDiscrementAction, createIncrementAsyncAction} from '../../redux/count_action'

export default class Count extends Component {

    // componentDidMount() {
    //     // 检测redux状态变化，只要变化,就调用render
    //     store.subscribe(() => {
    //         this.setState({})
    //     })
    // }

    // 加
    increment = () => {
        const { value } = this.selectNumber;
        store.dispatch(createIncrementAction(value*1))
    }

    // 减
    discrement = () => {
        const { value } = this.selectNumber;
        store.dispatch(createDiscrementAction(value*1))
    }

    // 奇数再加
    incrementAdd = () => {
        const { value } = this.selectNumber;
        const count = store.getState()
        if (count % 2 !== 0) {
            store.dispatch(createIncrementAction(value*1))
        }
    }

    // 异步加
    incrementAsync = () => {
        const { value } = this.selectNumber;
        store.dispatch(createIncrementAsyncAction(value*1,500))
    }

    render() {
        return (
            <div>
                <h1>当前求和值:{store.getState()}</h1>&nbsp;
                <select ref={c => this.selectNumber = c}>
                    <option value="1">1</option>
                    <option value="2">2</option>
                    <option value="3">3</option>
                </select> &nbsp;
                <button onClick={this.increment}>+</button> &nbsp;
                <button onClick={this.discrement}>-</button> &nbsp;
                <button onClick={this.incrementAdd}>当前和为奇数再加</button> &nbsp;
                <button onClick={this.incrementAsync}>异步加</button> &nbsp;
            </div>
        );
    }
}